Patient Reviews
GI Alliance physicians are among the most reputable and distinguished gastroenterologists across the nation. Focused on clinical excellence and patient-centered care, our specialists seek to be the partner you need in your quest for better health. We value patient feedback and appreciate every review we receive from those we are privileged to treat. For your convenience, we have gathered a collection of reviews, stories, and testimonials provided by patients who have visited our practices. We welcome you to explore the feedback below to learn more about what it means to be a patient of GI Alliance.
"This is my third procedure over the years at the center. I am very satisfied with the office, facility and especially Dr Thyssen. Dr Thyssen is an excellent physician. Everyone made an unpleasant but necessary procedure as comfortable as possible. Thank to everyone, the CRNA, Nena , procedure RN , the tech , and of course Dr Thyssen. The care received was excellent and compassionate . You are treated with dignity and kindness throughout your stay . Excellent, well organized and efficient, most importantly exemplary patient care."
"Love the personableness of Dr. Thyssen! The rest of the staff is also pleasant and helpful."
"I have every confidence in Dr Thyssens care. His staff is always pleasant."
"One of the best doctors I have ever had. Spends time to make sure he understands what’s going on and always has the right solution. Wouldn’t trust anyone else."
"First visit with Dr Thyssen after many years with another doctor at SIG. I was very pleased with his thoroughness and style and look forward to future dealings with him!"
"Dr Thyssen is a great doctor and very knowledgeable. His bedside manner is impeccable and he knows how to put his patients at ease. He explains things where you can understand with no problem. I had to wait to see him so that is why I didn't give 5 stars."
"Friendly professional staff who take great care of you!"
"Excellent Care and Professionalism. Dr Thyssen is excellent."
"Everyone was professional… I have never had the doctor call me the day after and asked me if everything was OK. I have had many procedures and this clearly is the best customer service ever. thank you"
"Excellent doctor. He really took his time with me. Very happy to be his patient."
"Very nice, disciplined and very professional 👏"
"Really love and appreciate the wonderful staff for the care. Thank you very much"
"Fast, friendly, and courteous. Really appreciate the changes made to the check in procedures!"
"Professional Friendly Courteous & Puntual"
"Dr thyssen and his support staff were very professional in letting me know the process in advance. The staff were very friendly and interested on my well being and comfort."
"Dr. Thyssen is so very caring and professional. I can not say enough grea things about how special he makes you feel seeing him."
"With a family history of colon cancer, I have been to see Dr. Thyssen regularly, since I was in my 40s. He has an amazing bedside manner and his post op report is given along with photos to clearly and quickly inform patients of results. I have recommended him to quite a few friends. My whole family agrees!"
"I had no problems at this place back Thursday February 22nd. All of the employees were very nice. They kept apologizing for the delay on the Office visit. Dr. Erik Thyssen was very nice. Had to do blood work and I had no problem with that in the office."
"An excellent first encounter with Dr Thyssen. He was thorough and impressive with his thoughts, and we mutually forged my path forward under his care."
"Everyone from the front desk to the nurse to Dr. Thyssen were friendly, polite and welcoming us on our first visit to this office. Dr. Thyssen asked questions and listened to our answers. After his examination and further conversation he gave me recommendations for ongoing care. By the time I checked out he'd already had his notes prepared and printed. I found Dr. Thyssen to be engaged in getting to know me as a new patient and an extremely pleasant conversationalist. It was an excellent start to what will be an ongoing relationship with him as my GI doctor."
"Procedure went very well, from prep instructions all the way to recovery. Well done."
"Great customer service. I have gone to Dr. Thyssen for approximately 10 years and ALWAYS satisfied. After appointment followup great also."
"Dr.T is professional and has a good sense of humor. His support staff were very good, also."
"great doctor and office. efficient, friendly and professional"
"Dr Thyssen and medical staff were very professional and provided excellent care."
"Dr Thyssen is knowledgeable, friendly and professional.!"
"Dr Thyssen is a wonderful doctor with a great bed side manner. Everyone in his office was very friendly too."
"Always amazed at how all of you over there turn what’s considered an awful ordeal into a friendly, informative, efficient -and yes, astoundingly, an overall pleasant experience! You’re magicians!"
"Everyone is so nice, you feel like your grandma is treating you.I would recommend to all my friends and family."
"Dr. Thyssen is the best! An excellent physician, I would never go anywhere else. He’s kind, personal and attentive to his patients. Wonder Dr!"
"Fine"
"One of the best and most fun experiences at a doctors appointment EVER! Erik is pure mojo magic and made the experience for me truly. Go!"
"I have never had a bad experience here .Everyone is so nice and helpful."
"He is very kind and through and explains results very clearly."
"MD Thyssen & his secretary Tonya is great!"
"Had a great experience with Dr. Thyssen"
"I have been a patient of Dr. Thyssen since 2012. He truly is one of the best doctors I have ever known. He’s very compassionate toward his patients and is extremely knowledgeable in his field. I would recommend him to anyone who has gastrointestinal issues."
"Have used Dr. Thyssen for almost 25 years. I can’t say enough good things. He’s an amazing human being. I’m blessed to have him in my life."
"Dr Thyssen, is very knowledgeable, takes time to answer all you're questions and is very kind. Friendly staff as well."
"I have left multiple messages stating that if one has to have a colonoscopy, this is the place to have it done. He is kind and gentle, a rare treat these days."
"Perfect place for all issues gastro-enteral."
"I would not go anywhere else dr. Thyssen and staff are friendly and always there if you need help"
"Very professional and caring"
"The facility and staff here are excellent. I cannot recommend them any higher. I have seen Dr. Thyssen twice. He is always pleasant and very professional."
"Very very awesome staff, I love Dr.Thyssen very funny and friendly, Thank you."
"Dr Thyssen is a great doctor."
"Very good Experience"
"Dr. Thyssen and the staff were very friendly and professional. I felt very safe and comfortable throughout my colonoscopy."
"Great doctor! No one enjoys a colonoscopy more than me and I'm lucky enough to get them every 5 years! Dr. Thyssen and the surgery center were wonderful!"
"Everyone is always very courteous and accommodating. The staff definitely go above and beyond. Dr. Thyssen is an amazing doctor!! He takes time to listen to any questions or concerns I have. I never feel like my time with him is rushed. He may have other patients waiting to see him or his next patient procedure is ready, he always makes sure my questions or concerns are answered."
"greeted and handled with patience .. Dr. Thyssen always so attentive to your needs, to try find out the problem of any issues. He and the staff are so kind"
"Wonderful people, helpful, fantastic Dr. Thyssen, nice to have all procedures in one building. Upper endoscopy, colonoscopies, blood drawn, infusion center, love Katie"
"Dr. Thyssen’s office is the best. From check in to check out. Highly recommend this office."
"Dr Thyssen is a wonderful Dr. Personable and always informative. Have used him for many years and recommend him 110%"
"Dr Thyssen is the Best, he is so friendly & takes his time talking to you about your procedure...I trust him completely. The Staff are very kind & caring... I would Recommend Dr E.Thyssen to everyone!"
"It really seemed like he cared about me. He took time with me which was appreciated."
"Amazing office staff & wonderful doctor. I finally found a doctor who cares, listens and wants you to feel better."
"The staff were very pleasant and helpful. Dr. Thyssen was thorough and made sure I understood everything. Dr. Thyssen called me the next day to give me the results of my bloodwork."
"Appt. Was to discuss and assess NAFLD. Dr. Thyssen is a very competent doctor, expert in his field. He explains everything calmly, honestly and thoroughly. His bedside manner is better than about 75% of the doctors I have seen over the years. I am confident in his ability to address my situation!"
"greeted and handled with patience .. Dr. Thyssen always so attentive to your needs, to try find out the problem of any issues"
"I’m a new patient of Dr. Thyssen. Our first appointment he listened, asked questions, ordered bloodwork immediately, scheduled me for testing, and mostly showed a great deal of compassion. It seemed that he cared. Also the staff so far is very professional and kind. I appreciate it very much! I hope he finds all the answers and that time proves he truly cares."
"Professional and expedient making the procedure seamless. Everyone was very kind and considerate, taking time to listen to the patient."
"He was compassionate and understanding and listened without judgment as I was going through a health crisis🙏"
"Excellent experience! Efficient and professional process. Dr Thyssen and staff are very caring and compassionate."
"Very professional and timely."
"Very professional and timely."
"Very kind. Listens. Communicates well. Would recommend. Great staff."
"The best GI doc on the planet"
"Dr. Erik Thyssen is absolutely the most caring, compassionate doctor I ever had. I LOVE HIM, the staff there was EXCELLENT. Thank you all for a very pleasant experience."
"Colonoscopy"
"Dr Thyssen and the surgical staff from AEC were very efficient and worked together as a very pleasant team. I would have given 5 stars except my phone call to SIG a week before the colonoscopy almost made me cancel. I called SIG to get a better clarification as to the pre-colonosocpy diet. Whoever I talked to seemingly got annoyed with me asking questions and I was told to stick to no seeds or I they wouldn't be able to do the procedure. How does anyone know they consider bananas to have seeds unless it's clearly stated. I found a diet sheet online from a credible university and followed that. Please include a diet sheet for patients to follow - people's interpretation of peel and and seeds vary. AEC didn't call me until the day before the case to pre-register me. For those two items I'm knocking off a star but the surgical team were the best."
"Awesome…the whole staff…was wonderful…👏"
"Caring kind efficient"
"I never feel rushed in my appointments like I do at some of my other doctors. He is very thorough and you can tell he cares about his patients. 5 stars always!"
"Dr Thyssen is the best! Such great bedside manner and he truly cares about his clients."
"Outstanding performance of the colonoscopy. Dr. Thyssen showed care, compassion and competence. He is supported by an excellent , experienced staff throughout the process."
"Everyone on the staff is dedicated to making sure the patient is cared for from the moment they walk in the door until the moment they are taken to their car by wheelchair. Dr. Thyssen is one of the best doctors in St. Louis and I am in good hands with him."
"Everyone was very friendly and professional Made things easy"
"Clinical excellence + compassion and genuine caring wrapped up into one human being is the best way I can describe Dr. Thyssen. He is a skilled GI doc who listens, asks questions and works with you to make sure you are getting great care. I am a nurse and really picky about the doctors I choose for myself and my family - Dr. Thyssen is fabulous!"
"This facility runs like clockwork. The staff is friendly and professional. They make sure you are comfortable throughout and make you feel cared for."
"They walked me through the entire process and were very comforting and professional."
"Dr Thyssen and everyone one his staff we welcoming and caring. I got lots of assurances and pats to comfort me. The Dr and all his staff are proficient and professional."
"When Tonya first took me back for my colonoscopy, I was concerned. She was not friendly or accommodating. She was harsh, hurried, and appeared very annoyed that I was there. After that introduction, the people got much better. The rest of the staff were friendly and nice. Dr Thyssen is always pleasant and I do have faith in his procedures."
"Amazing staff and Dr. Thyssen is a wonderful doctor."
"Great staff. Wonderful service. Dr. Thyssen was friendly, great and caring."
"It was an amazing experience everyone was truly stars…"
"Very professional from check in to procedure check out. Would definitely recommend."
"Very professional from check in to procedure check out. Would definitely recommend."
"Compassionate and thorough."
"Great service and personal level attention"
"Super sweet staff. They make you feel comfortable and very respectful. Procedure was quick and easy. See you in 10 yrs"
"Dr. Thyssen and his staff are attentive, doing everything possible to make the experience a positive one."
"Dr Thyssen is a compassionate and friendly physician. He took the time to explain everything to my mom and myself, and made us feel comfortable with the upcoming procedure. The employees at SIG were all easy to deal with, understanding and made my mom's experience comfortable and stress free. SIG has appointments and procedures all in one building which makes for ease of patient care. There's no running the gauntlet of hospital corridors, registration and bouncing from one area to another. I would highly recommend Dr Thyssen and his staff."
"Dr. Erik Thyssen has a wonderful bedside manner. He made me feel comfortable prior to and after a very intimate procedure. The entire staff that worked with me made this go very smoothly and my anxiety level was very low. Thank you!"
"Dr. Thyssen is very knowledgeable, thorough and has a pleasant bedside manner. Thank you Dr. Thyssen and staff!"
"Dr Thyssen explained everything and was very professional. The whole staff was friendly and attentive from start to finish."
"The supporting personnel are all very efficient and professional. They go out of their way to make you comfortable. Dr. Thyssen is awesome. He is so positive and explains the test results very clearly. Even though it is years between tests, he never forgets you. He, too, is so professional."
"Always excellent care. Staff and Dr Thyssen are wonderful. Highly recommend SIG."
"Extremely caring GI!"
"I was very pleased with everything SIG. From the minute I walked in to the time I was released, everyone was kind, quick, and efficient doing their individual jobs. In particular I’d like to mention Tonya, who was right by my side every time I needed help. A huge thank you to all."
"Everybody was nice sweet"
"Attention to patient is excellent and care and concern is evident."
"It was great, everyone was so loving and caring. They made my experience so smooth. Thanks to all."
"Dr. Thyssen and the entire SIG staff are superb!"
"Each member of the team exceeded expectations. The nurses, anesthesiologist, and Dr. Thyssen, were thoroughly prepared to provide patients with a warm and welcoming environment. They clearly were well trained and highly competent. Because of their professional expertise and attentiveness to detail, the patient is put at ease while undergoing what otherwise could be a stressful experience."
"Great, caring and compassionate doctor and staff!"
"Love him. He is really a wonderful person who listens. I have known him for 26 years. I enjoy going to the doctor. At least this one."
"Has a very good experience - great doctor, facility and staff. Am glad I went there."
"outstanding professional service by all from check in to check out"
"Dr. Thyssen was very personable and patient in answering my post-procedure questions, as were his support staff. The experience was calm, smooth and very professional. I cannot rate Dr. Thyssen and the Advanced Endoscopy Center too highly!"
"I have great respect for Dr. Thyssen. I have been going here for 20+ years as colon cancer runs in my family. He is very thorough and very knowledgeable. His staff is also the best and everyone does a fabulous job at this facility."
"Dr. Thyssen is the best! He has a great personality and everyone I’ve spoken to has a lot of respect for him as a physician and as a person. He has performed numerous Upper GIs and Colonoscopys on me and I trust his expertise recommendations!"
"Not something a person looks forward to but Dr. Thysseen made a note in his file the last time I was there about my playing golf and ask about my playing this time. Nice touch, making it more personable."
"Dr. Thyssen is an OUTSTANDING doctor - the best! He is knowledgeable, his diagnoses always right on the mark and his skill impeccable. He is also a compassionate and caring doctor, a rarity in today's medical field. I would highly recommend him."
"Dr Thyssen is the best and always has time to explain procedures and possible causes. He makes his patients comfortable with their choice."
"Wonderful team of people work here. Very caring and helpful. Dr Thyssen is the best!"
"I have been a patient of Dr. Thyssen for over 30 years. The professionalism on display in his practice is eclipsed only by Dr. Thyssen himself. I cannot imagine being able to find a more compassionate, dedicated person of medicine anywhere. He seems as much a friend as a doctor."
"Friendly, efficient and proficient. Skilled, talented and personable."
"The SIG team is the Best!!! I don't normally do reviews but I had too for this great group...I have worked in Healthcare for 20 years ( so I've seen it all) and I can say that Dr. Thyssen and his team went above and beyond my expectations! This was my first experience with Dr Thyssen, my appointment / procedure went seamlessly from beginning to the end, this group is on top of their game!!! They were prompt with scheduling, my procedure , check up and results. They also were able to provide pricing for the procedure(prior to it being done) which eased my mind. All of the staff were very kind too. It's very difficult to find a doctor, let alone, a team of knowledgable doctors who truly listen to their patients and have a great bedside manner. Thank You, to the SIG team & Dr Thyssen for a great experience! You guys are truly a diamond in the rough these days!!!"
"Dr. Thyssen was expert, thorough, courteous, reassuring."
"Great people very professional"
"The staff is a great team of healthcare professionals — kind, courteous, warm and respectful. Thank you."
"I am a long-time patient of Dr. Thyssen, so today’s positive experience was no surprise. The worst part of colonoscopy is the prep, but even it has improved over the years. The staff at SIG were friendly, professional, competent and prompt. The procedure was accomplished without discomfort and results shared with me before I was discharged. Dr. Thyssen is an extraordinary physician!"
"Dr Erik is the best, he’s a Godsend, this was not my first time for a procedure with him and as usual he was kind, concerned and caring as well as patient. I would recommend him to anyone. God Bless you Dr. Thyssen"
"You couldn't ask for a better Doctor, than Dr. Thyssen. He is kind, caring and knows his stuff ! He has been our Doctor for MANY years. Out whole family goes to him. Our Family has a long history of stomach problems. He is the VERY best ! And the other Doctor, Jennifer is a GREAT doctor too!! I can't say enough good things about them. They are like Family to us !!"
"All those involved were very professional and made the experience a more bearable one, considering that a colonoscopy is not a fun experience. Dr. Thyssen is amazing!"
"I needed a colonoscopy, Dr. Thyssen did it on a Sunday."
"I’ve been going to Dr. Thyssen for many years. He’s always professional, has a great bedside manner and makes sure you have all of your questions answered before you leave. When You have a scheduled appointment there’s never a long wait time. The staff is always very friendly and helpful, which I think is very important. Dr. Thyssen was recommended to me, and I’ve recommended him to several people. All the people that I have recommended to him have been very satisfied."